SN0325 : STAR Table Structures for TPC Data Distribution
Updated on Mon, 2007-06-18 19:57. Originally created by chajecki on 2007-06-18 19:57.
| Author(s) | : | R. Bossingham |
| Date | : | Feb. 12, 1998 |
| File(s) | : | sn0325a.ps.gz |
| Abstract | : | A format, involving STAF tables within a directory structure, is defined for STAR TPC raw data distribution and analysis. Normally, the TPC data are mapped onto the TPC pad planes, but a secondary format is based on the front-end electronics. The relationship of the data structures to the on-line event server and off-line cluster/hit-finding is explored, since both should be able to use the structures efficiently. A weak restriction is that sequence lengths cannot exceed 256 time bins. The format evolved from, but is not compatible with, the MiniDAQ cosmic-ray test format [R. Bossingham, SN0282 (1997)]. The new format better supports 24 TPC sectors, indexes the data at finer granularity, and is more appropriate for event serving, use with the real DAQ, and high track density. Venus+tss simulation results [I. Sakrejda (1998)] predict an overhead of ~21% for central Au-Au events. The ~61 KB/event overhead for sparse events (e.g., peripheral collisions) is higher percentage-wise (~285%), but still acceptable in absolute terms. |
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